ELECTRIC HAND TOOL MACHINE

Description

[0001] The present invention relates to an electric handheld power tool with a housing and a tool holder. Such handheld power tools, for example in the form of hammer drills or drill drivers, are generally known from the prior art.

[0002] Some examples are known from DE 10 2009 045235 A1, DE 10 2016 218775 A1, DE 101 18 034 A1 or DE 10 2018 107726 A1.

[0003] It is an object of the present invention to provide an electric hand-held power tool which enables comparatively comfortable handling.

[0004] The task is solved in that the hand-held power tool has a TOF sensor arranged on or in the housing, the field of view of which is oriented in the direction of the tool holder, so that the TOF sensor can detect a tool to be held in the tool holder.

[0005] The TOF sensor is a 3D camera system that can measure distances using the time-of-flight (TOF) method. TOF sensors can also be referred to as TOF cameras, PMD sensors, or PMD cameras. The PMD sensor or PMD camera is a photonic mixing device, which is essentially an optical sensor whose operating principle is based on the time-of-flight method.

[0006] The invention incorporates the recognition that different tools, such as inserts such as drills or the like, can have different effects on the performance requirements of an electric handheld power tool. For example, drilling a hole with a comparatively large diameter (e.g., 30 mm) requires considerably more power than drilling a comparatively small hole (e.g., 5 mm). The tool itself can also be designed differently depending on its application. Since the tools are typically universally applicable, the handheld power tool does not "know" which tool is currently mounted in the tool holder. Individual adaptation of the handheld power tool to the respective tool is the responsibility of the user. This individual adaptation can, for example, relate to speed, torque, impact rate, or other similar operating parameters.

[0007] The handheld power tool according to the invention, however, enables the detection of a tool held in the tool holder using a TOF sensor, thus creating the basis for automatic or at least partially automatic adaptation of the handheld power tool to the respective tool. This increases both comfort and safety for the user. TOF sensors are typically very robust and tolerant to environmental influences such as light, surface, etc.

[0008] In a particularly preferred embodiment, the handheld power tool has sensor electronics configured to determine at least one tool-specific tool parameter based on a sensor signal received from the TOF sensor. It has proven advantageous if the at least one tool parameter is a length, shape, and / or size of the tool. The tool parameter can also be a drill type, for example, a "stone drill," a "metal drill," or a "wood drill."

[0009] In a particularly preferred embodiment, the handheld power tool is equipped with control electronics configured to adapt the one operating parameter based on a control signal received from the sensor electronics. In a particularly preferred embodiment, the control signal received from the sensor electronics relates to the tool parameter(s). It has proven advantageous if comparison or reference values ​​of the at least one tool parameter and / or operating parameter are stored in the sensor electronics and / or the control electronics, preferably in the form of a look-up table.

[0010] In a further preferred embodiment, the sensor electronics are designed to determine a penetration depth of the tool into a surface to be machined based on the sensor signal received from the TOF sensor. It has proven advantageous if the control electronics adjusts at least one operating parameter based on the determined penetration depth. For example, if the tool is provided in the form of a drill, a rotational speed can be reduced by 50% (i.e., 50 percent) if the penetration depth of the drill into the surface to be machined is, for example, 80% (i.e., 80 percent) of its total length.

[0011] In a further preferred embodiment, the sensor electronics are designed to determine tool wear based on a sensor signal received from the TOF sensor. The handheld power tool can have a display for displaying and / or acknowledging at least one tool-specific operating parameter. It has proven advantageous for the display to indicate the tool wear to a user.

[0012] As stated in claim 1, the handheld power tool is battery-operated. Furthermore, as stated in claim 1, the housing has a battery base on or in which the TOF sensor is arranged. In a particularly preferred embodiment, an angle between a central axis of the field of view and a rotation axis of the tool is at least 30° (i.e., 30 degrees).

[0013] In a further preferred embodiment, the tool holder is designed to hold a rotating and / or striking tool.

[0014] The object is also achieved by using a TOF sensor for detecting a tool held in a tool holder of an electric handheld power tool, wherein the TOF sensor is included in the electric handheld power tool. The use according to the invention can be further developed in a corresponding manner by the features described with reference to the handheld power tool.

[0015] Further advantages will become apparent from the following description of the figures. Various embodiments of the present invention are illustrated in the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0016] In the figures, identical and similar components are numbered with the same reference numerals. It shows: Fig. 1 shows a first preferred embodiment of an electric hand tool according to the invention in the form of a hammer drill. Examples of implementation:

[0017] A preferred embodiment of an electric hand tool 100 is Figure 1 The handheld power tool 100 is equipped with a housing 90 and a tool holder 80. In the presently illustrated embodiment, the handheld power tool 100 is designed as a battery-operated drill / driver with a battery base 95. The battery base 95 is understood to be part of the housing 90.

[0018] The handheld power tool 100 has a TOF sensor 30 arranged on the housing 90 in the region of the battery base 95. A field of view (FOV) of the TOF sensor 30 is oriented toward the tool holder 80, so that the TOF sensor 30 can detect a tool 200 clamped in the tool holder 80. The tool holder 80 is designed to hold a rotating tool 200. The tool 200 is provided, for example, in the form of a drill with a rotation axis RA.

[0019] The TOF sensor 30 emits modulated infrared light via a transmitter array 31. This light is at least partially reflected by the tool 200 and received again by a receiver array 33 of the TOF sensor 30. The measured phase difference between the emitted and received light, as well as the amplitude of the received light, are evaluated by sensor electronics 40, which is signal-connected to the TOF sensor 30, and yield very precise distance information and contours of the tool 200. This allows the tool 200 to be recognized very precisely and reliably, for example, in terms of shape and size. Accordingly, the sensor electronics 40 is included in the handheld power tool 100 and is designed to determine at least one tool parameter of the tool 200, in particular length, shape, and / or size, based on a sensor signal received from the TOF sensor 30.

[0020] Again Figure 1As can be seen, an angle WA between a central axis MA of the field of view FOV and a rotation axis RA of the tool 200 is approximately 45 degrees, ie at least 30 degrees. This means that the tool 200 is detected obliquely or laterally by the TOF sensor 30, which leads to a distorted image of the tool 200. However, this distortion can be "calculated out" by the sensor electronics 40. As the Figure 1 can be seen, the angle WA is meant which is located between a tip 201 of the tool 200 and the rotation axis RA of the tool 200 on the side of the rotation axis RA facing away from the battery base 95.

[0021] In the presently illustrated embodiment, the handheld power tool 100 further comprises control electronics 50, which are designed to adapt at least one operating parameter of the handheld power tool 100 based on a control signal received from the sensor electronics 40. This will be explained in more detail using an example. The tool 200 is provided in the form of a drill. The drill is detected by the TOF sensor 30, wherein the TOF sensor 30 is signal-connected to the sensor electronics 40. In the sensor electronics 40, reference values ​​for typical drill diameters, lengths, types, etc. are stored in a look-up table. Based on the sensor signal received from the TOF sensor 30, the sensor electronics 40 can now determine that a stone drill with a length of 150 mm and a diameter of 10 mm is clamped in the tool holder 80.For this drill, for example, a maximum tool holder speed of 1000 rpm can be set using the control electronics 50. This maximum speed is a tool-specific operating parameter.

[0022] In the presently illustrated embodiment, handheld power tool 100 further includes a display 70 for displaying and acknowledging at least one tool-specific operating parameter. For example, a maximum tool holder speed of 1000 rpm is displayed for the determined drill type. The user can acknowledge this operating parameter via display 70, whereupon control electronics 50 implements this setting. Alternatively, the user can, for example, decrease or increase this operating parameter via display 70 and then acknowledge it.

[0023] According to a further aspect of the invention, the use of a TOF sensor 30 for detecting a tool 200 received in a tool holder 80 of an electric hand-held power tool 100 is proposed, wherein the TOF sensor 30 is included in the electric hand-held power tool 100. List of reference symbols

[0024] 30TOF sensor (Time-of-flight sensor) 31Transmitter array 33Receiver array 40Sensor electronics 50Control electronics 70Display 80Tool holder 90Housing 95Battery base 100Electric hand tool 200Tool 201Tool tip MACenter axis FOVField of view RARotation axis WAAngle

Claims

1. Electric hand-held power tool (100) with a housing (90) and a tool fitting (80), characterized in that the hand-held power tool (100) is battery-operated, the housing (90) having a battery locking foot (95) on which or in which a TOF sensor (30) is arranged, the field of view (FOV) of which is oriented in the direction of the tool fitting (80), so that the TOF sensor (30) can detect a tool (200) to be fitted in the tool fitting (80).

2. Hand-held power tool (100) according to Claim 1, characterized in that the hand-held power tool (100) has sensor electronics (40) which are designed to determine at least one tool parameter of the tool (200), in particular its length, shape and / or size, on the basis of a sensor signal obtained by the TOF sensor (30).

3. Hand-held power tool (100) according to Claim 2, characterized in that the hand-held power tool (100) has control electronics (50) which are designed to adapt at least one operating parameter of the hand-held power tool (100) on the basis of a control signal, relating to the at least one tool parameter, obtained by the sensor electronics (40).

4. Hand-held power tool (100) according to Claim 3, characterized in that comparison or reference values of the at least one tool parameter are stored in the sensor electronics (40) and / or in the control electronics (50), preferably in the form of a lookup table.

5. Hand-held power tool (100) according to Claim 3 or 4, characterized in that the sensor electronics (40) are designed to determine an amount of wear of the tool (200) on the basis of a sensor signal obtained by the TOF sensor (30).

6. Hand-held power tool (100) according to at least one of Claims 3 to 5, characterized in that the sensor electronics (40) are designed to determine on the basis of a sensor signal obtained by the TOF sensor (30) a depth of penetration of the tool (200) into a surface to be worked and to adapt the at least one operating parameter, for example a speed, on the basis of the depth of penetration.

7. Hand-held power tool (100) according to at least one of the preceding claims, characterized in that the hand-held power tool (100) has a display (70) for indicating and / or acknowledging the at least one tool-specific operating parameter.

8. Hand-held power tool (100) according to at least one of the preceding claims, characterized in that an angle between a central axis (MA) of the field of view (FOV) and an axis of rotation (RA) of the tool (200) is at least 30 degrees.

9. Hand-held power tool (100) according to at least one of the preceding claims, characterized in that the tool fitting (80) is designed for holding a rotating and / or striking tool (200).